Oil filtering device



May28 1940. B. HEWEL OIL FILTERING DEVICE Filed Jul 3 1936 WITNESS s Sheets-Shag; 1

INVENTOR fizz/7,45 B. Hewefi 22/0 R-% ATTORNEY V May 23, 1940. F. B. HEWEL 7 r on. FILTERING DEVICE Filed July 3, 1936" 3 Sheets-Sheet 2 F/yz WITNESS' INVENTOR ATTORNEY May 28, 1940;

F. B/HEWEL OIL FILTERING DEVICE v Filed July 5, 195s s Sheets-Sheet s INVENTOR fiww B Hewel.

BY w ATTORNEY v Mains. 1940 2,202,379

UNITED STATES PATENT? OFFICE" 1 5321.ZJZY'QQZZZZZZ"....5 VII My invention relates to oil filtering devices Fig. 3 is a fragmentary view of a portion of the and particularly to such devices for use in autoapparatus of Fig. 1 occupying a different posimotive vehicles. tion; and Y I At the present time, it is almost universal Fig. 4 is a perspective view of an element of.

a practice to change the motor oil in automobiles the apparatus shown in Fig. '1. 5

and trucks periodically, usually at the end of Referring to the drawings, the oil filtering de some fixed mileage such as one thousand or fifvice herein shown comprises a top or cover structeen hundred miles, this change being made beture 65, an outer casing or receptacle 66, an intercause of grit, sludge or acid in the oil which tends mediate casing 61 and an inner casing 01' recep- .to impair its lubricating value. The expense and tacle 68, all three casings being preferably contime required to make these frequent changes of centric, a filling tube structure 69 at the bottom motor oil are too familiar to require any exof the apparatus, and a sliding vertically extendtended discussion here. ing cylinder structure 10 located in the upper One object of my invention, therefore. is to portion of the oil 'filter and cooperating with a provide an oil filteringv device whereby the motor movable metal filter 'll of the edge typ as sub.- 15

oil may be used for "an indefinite period, the only sequently more fully described.

attention required being periodical replacements The upwardly. extending walls of the casings of the filtering material, which replacements re- --61 and 68 are respectively preferably slightly quire less expense and time than would replacetapered outwardly and inwardly toward the botments of the motor oil itself. tom, ,while the walls of outer casing 66 may be A further object of my invention is to provide, substantially vertical, for purposes to be set forth. in a structure. of the type described above. a The top cover member 65ispreferably provided sump at the bottom of the outer casing to efiect with swingable wing n f t ning devices'il, and separation of moisture from the oil to be filtered. suitable dashboard-fastening devices 6 and. 1

Another object of my invention is to provide are also-preferably employed with the structure 25 the outer casing with a slight-degree of. taper, shown.

whereby the roll of woven material that substan- The underside of the cover 65. is provided with tially' fills the outer chamber may be readily rea preferably integral central boss 15 and with an moved along with the inner casing. annular boss or downwardly-extending flange '|6 Another object of my invention is to provide located approximately two-thirds of the distance so a device of the character described in which the between the center and the periphery of the top cover and the oil pipe connections are permaplate, although this particular radius is not imnently secured to a dashboard or the like, whereas portant. The purposes of the bosses I5 and 16 the remainder of the device is detachably secured will be subsequently set forth.

85 to the dashboard, thereby permitting ready re- The outer casing or receptacle 66 comprises a 85 moval in the event of it becoming necessary'to slightly tapered upwardly-extending wall TI to make replacements of the filtering materials. which 'is secured a bottom cap 18 by welding or Another object of my invention is to provide otherwise. This receptacle 66 is, therefore, closed an oil-filtering device with a metal edge filter in at the bottom and open at the top, being clamped 40 one chamber and a cloth roll or ledge filter in to the cover '65 by wing nuts 9 in any suitable 0 another, the oil to be filtered being directed manner. through the chambers in a predetermined order. A petcock 19 may be suitably aflixed to the.

A further object of my invention is to provide bottom cap" for the purpose of permitting a movable metal edge filter and a cloth filter in drainage from the sump 80. constituting the an oil-filtering device, togetherwith a cage for lower portion of receptacle 66 below the lower 5 restricting movements ott'he metal filter. edges of the intermediate and inner casings 81 Other objects of my invention will become eviand 68, respectively. dent from the following detailed description, A coarse screen 86, supported by lugs 86a on taken in conjunction with the accompanying inside walls of casing 66, serves to 'hold a roll or 5 0 drawings in which: edge filter of cloth 2 in place between inter- Fig. l isa view in longitudinal section of an mediateand inner casings 61 and 68, whenever oil-filtering device constructed in accordance with jarring of'vehicle might tend to loosen the roll. my present invention; p Theintermediate casing 61 is open at the bot- Fig. 2 is' .a sectional view taken along the line tom and is provided near its upper end with an 05 II II of Fig. 1; I inwardly-extending shoulder 8| and terminates in a substantially vertically-extending flange which is secured by means of four screws 82, for example, to the outer periphery of the annular boss 16 on the under side of plate 65. A short distance below the plane of the screws 82 a plurality of small holes 83 are provided in the intermediate casing 61 for a purpose to be set forth.

The inner casing or receptacle 68 is provided with a bottom portion 81 which tightly encloses the upper end of filling tube 69, while near the upper end of the casing 68 an outwardly-extending shoulder 84 is provided and the casing terminates in a substantially vertically-extending flange which is likewise secured to the annular boss I6 (within the top flange of. intermediate casing 61) by means of the above-described screws 82. A plurality of small holes 85 are provided in the vertical flange of inner casing 68, these holes registering with the holes 83 in the intermediate casing 61.

The filling tube I59 may be of any suitable type and dimensions, being employed for filling or cleaning purposes, and comprises a main tubular member 88 which is suitably peened over or otherwise secured within an opening in the bottom plate 81 of inner casing 68 to provide a fluid-tight connection. An intermediate flange 89 is provided with a gasket 90 just within the bottom cap I8 of outer casing 68, and a nut 9|,

with gasket SM, is secured just below the cap 78,

being turnable on the lower threaded portion 92 of the tube 88 to properly tightly assemble the ilustrated parts. A suitable removable cap 93 is threaded on the lower end of the tube 88 when cap 93, nut 9| and gasket 9Ia. are removed, as

well as top wing nuts 48 and rods 44 thrown open,

outer casing 66 may and removed.

The movable or sliding cylinder structure I8 is shown as comprising an outer movable cylindrical member or guide means 94 having a rounded bottom 95 and which is open at the top, while a second cylinder or stationary guide 96 of smaller diameter and slightly spaced from the he slid over filling tube 69' outer member 94 is secured by means of a plurality of screws 91, for example, around the central boss I5 on the under side of cover plate 65.

A suitable number, such as four, of wires or rods 98 extend outwardly and downwardly from near the upper end of the inner cylinder or stationary guide 96, to which they are secured by welding or otherwise, as indicated at 99, to the vertical flange of the inner casing 68 to which they are secured by welding or otherwise, as indicated at I00.

Substantially in the same plane as the shoulder 84 of the inner casing 68 are a suitable number, preferably four, of wires or rods IN, the inner ends of which bear or slide against the surfaces of outer movable member 94 by means of suitable T-shaped ends I02, for example, while the other ends of the wires or rods II are welded or other-.

wise secured to the inner casing 88' close to the shoulder 84, as indicated at I03.

Another set, preferably comprising four, of rods tween or cage formed by the sloping rods 98 and the horizontal rods IN. The inner convolutions or coilsof the edge filter I01 are suitably secured by welding or otherwise to the upper end of movable member 94, so that the edge filter is movable up and down with the slidable member 94, in accordance with oil pressure, as hereinafter more fully described. The outer coil of the filter, in accordance with a known practice, is fixed with respect to the wall of chamber 68 between the outer portions of said rods, as shown in Figs. 1 and 3. This up and down relative movement of the adjacent coils of the edge filter renders it self-cleaning, in accordance with well known principles.

An inlet tube I08 for the oil extends through cover plate 65 near one edge thereof, through the shoulder 8I of intermediate casing 61 and then has a horizontally-extending portion vI09 piercing the inner casing 68 just below horizontal rods IOI. Consequently, this inlet pipe communicates with the inner casing or receptacle 68.

The outlet tube 0 for the oil after it has been filtered extends through the top plate 69% a point opposite the inlet tube I08, although this is not essential, and pierces the shoulder 8| of the intermediate casing 68, thus communicating with the top of the chamber or space between the inner receptacle 68 and the intermediate casing An annular screen III preferably extends between the walls of the intermediate casing 81 and the inner casing 88 just below the plane of the inlet pipe section I09, being retained in place by suitable shoulders or otherwise on the casing walls, and preferably the entire annular space between the screen III and the lowermost surfaces of the intermediate casing 81 and inner casing 88 is filled with a roll or edge filter N2 of filter material, such as silk or wool, preferably,

a body of oil to be filtered, which will occupy,

different levels during the operation of the filter, as pumped into and out of the filter.

By reason of the divergently tapering walls of casings 81 and68, the canton flannel roll II2 may be prepared independently of the filtering device and then inserted in place. By removing the outer casing 66, as previouslyjdescribed, along with screen 86, the used roll may be readily removed and replaced-by a fresh roll. I

v The operation of the filtering device shown in Figs. 1 and 2 may be described as follows: The dirty oil from the crankcase or motor flows into inlet pipe I08, as indicated by arrows, and thence through pipe I09 into the inner receptacle .forming the body I I3. The pressure of this oil against the bottom portion 95 of the movable member 94 and against the edge filter I01 at times serves to force the edge filter I01 into its illustrated uppermostpo sition, but, when the oil level or pressure drops, by reason of the engine stopping, for example, the weight of the movable member 94 and metal edge filter III'I causes them to drop to a position where the edge filter engages horizontal rods IIII, as shown in Fig. 3. The edge filter IO'I thus operates in a cage comprising the upper members 98 and lower members I8I, and the 7 up and down expanding and contracting movement of the edge filter serves to automatically filter H2 of canton flannel and then out through the outlet pipe H back to the engine.

In this way the oil is first filtered or cleansed by:permitting sludge and other heavy material to sink to the'bottom of the inner receptacle 68, then works its way through the metal edge filter I01 and finally through the canton flannel edge filter I I2, so that the oil when flowing out of the pipe U0 is fully' cleansed and purified and'substantially restored to its initial lubrication characteristics.

It will be seen that I, have thus provided an oil filtering device which effectively removes all sludge, grit, acid and water from used oil and restores to it its original lubricating characteristics. As a result, the oil may be used for an indefinite period of time and, when it is necessary to replace the filtering material, this may be readily accomplished by the means provided, only a short period of time being required to replace the relatively inexpensive filtering material employed. v

I do not wish to be'restricted to the specific structural details or arrangement of parts herein set forth, as various further modifications thereof may be efiected without departing from the spirit and scope of my invention. I desire, therefore, that only such limitations shall be imposed there, on as are indicated in the appended claims.

I claim as my invention:

1. An oil filtering device comprising an upper chamber and two adjacent concentric lower chambers, a cloth roll filter disposed in the outer lower chamber, inlet means for 'conveying oil under varying pressure into one of said lower chambers and to force the oil through all three chambers in series, outlet' means for thereafter conveying said oil from the otherof said lower chambers, a metal edge filter in the upper chamber and comprising contiguous coils closely nested and spirally arranged, means for fixing the outer coil of the filter with respect to the wall of one chamber, a vertically extending cylindrical member connected to the inner coil of the edge filter and having a closed lower end, the coils of said edge filter being movable by pressure of oil exerted on the edge filter and on said lower end for causing relative movement between the adjacent coils of said metal edge filter.

2. An oil filtering device comprising an upper chamber and a lower chamber, a movable metal edge filter in the upper chamber and comprising closely nested contiguous coils spirally arranged, means for fixing the outer coil of the filter with respect to the wall of one chamber, means for forcing the oil to be filtered through said chambers and said filter in a predetermined order, a

hollow cylindrical member secured adjacent its upper end to the inner coil of said filter, said member extending downwardly below the filter and terminating in a closed lower end, a cover for the upper chamber, a guide secured to the cover and extending downwardly to a position within the member, said filter and member being movable in response to the pressure of oil actin thereon'for causing relative movement between the adjacent coils of the filter. V

3. An oil filtering device comprising a casing, a metal edge. filter for the oil within the casing and having a plurality of closely nested, spirally arranged, contiguous coils, one of said coils being fixed with respect to the inner wall of the casing, a hollow cylindrical member secured adjacent its upper end to the inner coil 01 said filter, said member extending downwardly below' the filter and terminating in a closed lower end, a cover for the casing, aguide secured to the cover and extending downwardlyto a position within the member,-a chamber for oil within the casing, said filter being positionedin the chamber, means for forcing oil through said chamber and filter in the direction of movement of the member, the pressure of oil on said filter and on the member being effective to move said coils edgewise to ef- Iect cleaning of adjacent'coils one by the other.

4. In an oil filtering device as set forth in claim 3, means for limiting the movement of the metal edge filter in each direction after a predetermined distance of travel.

5 An oil filtering device comprising a casing forming a chamber to contain oil, a metal edge filter within said casing, means for forcing oil into said chamber and through said filter, said filter comprising contiguous coils spirally arranged, means ior fixing one coil of the filter with respect to the casing, a hollow cylindrical member secured adjacent its upper end to the inner coil of said filter, said member extending downwardly below the filter and terminating in a closed lower end, a cover for the casing, a guide secured to the cover and extending downi wardly to a position within the member, said filter and member being vertically movable in response to changes in oil pressure acting thereon in the chamber for causing relative movement between adjacent pairs of coils that are positioned between said last-named coil and the fixed coil, and a cage for limiting movement or 

